Line blind



' Aug.1,'1 944. 15. a PERRY 2,354,967

LINE BLIND Filed July 27, 1942 2 Shee ts-Sh ee't 1 00mm E'PE QK INVENTORAug. 1, 1944. PERRY I 2 ,354,967

- LINE BLIND I Filed July 27, 1942 2 sheetse-sheet 2 DOA A40 E. PERRKmvsm'ox Patented Aug. 1, 1944 "u NiTE -D "STATES o;-F;l=alcl-:.

MacGlatcliie Manufacturing" Company of California, Compton, Calif.,:a'col'poration 'of=Ca.'li;;

fornia Appl cation mini, 42,1SerialNoisasa 71 Claims.

My invention relates to new and useful improvements in line blinds.

The line blind has been generally used as a closing means for fluidcarrying pipe lines. in which a positive closing device is desired. Inlines of this type the ordinary gate valve is not satisfactory becauseof the danger of slight leakage and because small leaks might passundetected.

The so-called line blind, as used to completely .blank oil pipe lines,in its ordinary form consists of a flat metal plate bolted between twoflanges and sealed by thin rings of packing. Because of the labor timeinvolved in bolting and unbolting .these flanges in installing .orremoving the blind, various devices have been invented whichmechanically hold the blind in, place or which mechanically hold sometype of sealing means against the blind. The chief disadvantages ofthese blinds are that they are of relatively expensive; construction,that theyare mechanically actuated, and that they need constantadjustment and replacement of worn parts. The object of my invention isto provide a .line blind in which there are no longitudinally movable oradjustable parts. f

Another object of my invention is to provide a line blind in which thefiuid controlling means is adapted to be inserted in a slo't in Ithebodyof the line blind, held in slight frictional engagement in saidslot, andprovided with flexible sealing lips formed in such a mannerthat adifierence in pressure between the inside a nd outside of the lineblindwill expand the sealin'g lips tightly against the adjacent surfacesofthe body, thus effecting a seal which becomes stronger as the differencein pressure increases. Another object of my invention is to provide a.-line blind in which the fluid controlling means is provided with asealing memberwhich-is-so formed that no fluid within the line canpenetrate beneath or around the edges of said sealing. member.

Another object of my invention is to provide a line blind in which thefluid controlling ineans is adapted to be inserted in aslot in the bodyof theme blind-"held in frictional -engagement in said slot, andprovided with means so that-it My invention hasiother obieicts whichwill be evident from a stu or the gfolllowi'ng specificablind embodyingthe features of my invention without the fluid controlling means inplace in the line blind. 1"

Figure '2 is a view -taken .on the line 2.2 of

Figure 1.

Figure 3 is va. vi taken on'the line 3..-.e;3 of

, Figure 2, with the plate which allows for "flow through the line.

Figure i4-is apl view of aspectacle embodying the features of-nnyinvention-..

}dicates a body,-us1ially an integraleasting, the

ends of which are jisllally provided with means l :50 that the{bod-ycan-be vconnected to pipes and -bers 20,, need I the like. A fluidpassage l l preferably cylindri- ;c al extends through the. [body 10.The body J0 -;-has-a vertical-orxtransverse=slot IL-thesides .13 ofwhich, i. e. {the fii iacent surfaces, are ma- 'cl'lined,v Theslot 12;is adapted to receive one or the other of new controlling members10,40.

T e fl w' ontmll s member .1 0. may -connected together by ;a connectingmember -Il -:to form :a spec sclefi. as 's wnin-Figure 4.

ifzdeslred. However the new c roll n emb nne d to eth r. in which event,they ar usually provided with :handles in other means to facilit te e eo handling.

When. flow through the-line is desired, th fl controlling member :20 isinserted the slot l2. 'Theflow controlling member .130 comprises a nemetal plate 2| of *circularxliormand a resilien sealing member "22. Theplate #2] is provided with a circular ropenlng or orifice :23 which :is

preferably of the same size as the massage :I'l

circular underciit portions 12.4, and with circula-r g rooves 25 ch-both of' i-ts'iaces to position the :sealing ember zz. "The sealingmember 22, 'usuallyformed on rubber-and preferably molded,

"that- From-' the foregoing descriptiom nection with theaccompanyingdrawings the uses,- advantages; and operation of the line-blind -ofmy I.invention. will be. readily understood-ihy ,appertains. ciple ofoperation, ,togetherq ith the :form; Q ,1y e swhi hi u-np .censidemq bth s flexible sealing lips 29 and so, one facing inward 1i 1 and theother outward. r These lips which, are

usuall molded are fo1med :in .;su ch: 'annersthat a difference inpressurebetween the :inside and the outside of the body will expand thelips tightly against the machined surfaces-l3 of the body I0, thusefiecting a s'eal'which becomes stronger as the difference in pressureincreases. I When apomplete shut-ofi is desired, the.flow member; 40inserted in the slot l2.

co i e i 'Thef fliow controlling' member ifl fc omprises a lflat metalplatelf'o'f circular form "and resilient sealing members Hand 43. 4 'Theplate 4| is provided with circular grooves '44 and 451 on both of itsfaces in order toposition the sealing membersf42 and 43 respectively.The portions of the plate inside of'the grooves 44-andl45'are'preierably'"undercut, asindicate'd at 4611 I 1 The sealing members42 and lle, usually formed of rubber and preferably niolde'd are flat,

,of circular form, and haveouter rings or flanges Q'Ij 'and 'KBjwhich'are adapted to be inserted in grooves 44 and 45 respectively. Thecenter disc portions 49' prevent any fluiddnthe-passage II frompenetrating j behind" the rings 41" and 48-. A

The thickness of the new controlling member 1w withrlation to the-"widthof-th 's1ot l2 s ,such that it is held in slight fric V tional contactwith 'the machin ed surface sl3? The rings 41 and 4 8 are providedwith'twoflexible sealing lips 49 and" 50-,"'o'n'e facing inward and theother outward. These lipswhioh;a re usuallymolded'are formed in suchamanner friction seal-between the sealing lips and the machined adj acentsurfaces, 'eith'er pressure "or vacuum within-the -1ine 'will cause thesealing lipsto s'eal off-tightly, and no "fluid inthe line can penetratebeneath-the 'rings'of the sealing -meinbersbecause of the connectingmembers beitween the= rings of the sealing -members,--- (2 'r'noreeconomical operation and -:ma1ntenance;

this is due to the fact that the line blind 'has "no -longitudinallymovable parts and no adjust- -.rnents need to'be'f made, becausethefluid seal is automatically effected, and (3) easeo 'f acture, due tothesimple design: .2 :Z

f manutaken in condes' to ave it: n e

difference in pressure'between the inside 2. ahdthe' utsideo fthebodywill expand the lips 'ti'ghtlyagainstthe' machind' surfaces I 3'of the body 1 10, thus err ting a seal {which becomes i'strongen as thedifference in pressure =increas'es. "-7 The advantages of the blind ofmy invention V are: 1) le'ak proof operation -underany pressure; this isdue to the fact thatthere is aslight stood that the form shown is merelyillustrative and that the invention is not to be limited to the detailsdisclosed herein, but is to be accorded the full scope of the appendedclaims.

I claim:

1. A line blind comprising a body having a ,rfluid passage. a slot insaid. body perpendicular "to said passage, and a flow controlling memberin said slot, said flow controlling member comprising an annular platehaving annular grooves oneach side thereof and an annular sealing memberhaving rings adapted to be inserted in said-grooves; and having annularportions con- .-;necting said rings whereby fluid is prevented frompenetratingibehind said sealing member.

2. A line blind comprising a body having a fluid passage, a slot in saidbody perpendicular "to saidpassage','and a flow controlling member insaid slot, said flow controlling member comprising an annular platehaving annular grooves on each" side thereof and an annular sealingmember having rings adapted to be inserted-in said grooves and havingannular portions connecting vsaid rings whereby fluid is prevented frompenetrating behind said sealing member, said rings having flexible lipsadapted to provide an automatic fluid seal between said sealing memberand the surfaces of said slot.

3, A line blind comprising a body having a fluid passage, a slot in saidbody perpendicular to said passage, and'a flow controlling member insaid slot, said flowcontroll'ing member comprising an annularplatehaving an annular groove on' each sidethereof and an orifice, andsealingmembers'having ringsadapted to be inserte'dj' in said grooves anddisc-shaped portions within said rings whereby fluid is prevented frompenetrating behind said sealing members.

1455A line blind comprising a body having a fluid passage, a slot insaidbody perpendicular tojsa-id' passage, and a flow controlling member in said'slot,'said flow'controlling member comprising an annular platehaving an annular groove on each side thereof and an orifice, andsealing members having rings adapted to be inserted in saidgrooves andthin members covering-the inner portions of said rings whereby fluidis}prevented from penetrating behind saijd in'-'sa-id slot; said flowcontrollingmemb rj comprisifig 'an annular plate een; an f'annulargroove "andffa' sealing member h ng- -a ring adapted to be 'in'sert'edin' said graeva anq a thin mem er-covering the innerportion;of saidjring 'whereby the" fluid is prevented from penetrating behind saidsealing' member g 2 I I I :5 1 E granny.

saidpassaga'fand"aflow-controllin me mber

